Good weightlifting requires the feet to be still. More to the point, they should be pushed into the floor or footrest.
A prone, supine, or seated exerciser may easily move his feet. But the torso would inevitably lose some of its stillness because moving feet are not connected to the ground, which helps brace the torso. The limbs do almost all of the actual moving during seated and lying strength exercise; they cannot apply maximum force if the torso is not still. Limbs are levers anchored in the torso – the limbs lose leverage whenever the torso moves even slightly.
Fatigue is the great enemy of still feet. A tired lifter often moves his feet and will even thrust a leg into the air. His limbs lose strength and power just when these qualities are most needed.
The sound way to lift is to apply more force to the ground through the feet. Stop dancing and you’ll probably grind out a few more reps.
